﻿// Copyright (c) 2014 Daniel Grunwald
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System.Diagnostics;

namespace ICSharpCode.Decompiler.IL
{
	public sealed partial class LdFlda
	{
		internal override void CheckInvariant(ILPhase phase)
		{
			base.CheckInvariant(phase);
			switch (field.DeclaringType.IsReferenceType) {
				case true:
					Debug.Assert(target.ResultType == StackType.O,
						"Class fields can only be accessed with an object on the stack");
					break;
				case false:
					Debug.Assert(target.ResultType == StackType.I || target.ResultType == StackType.Ref,
						"Struct fields can only be accessed with a pointer on the stack");
					break;
				case null:
					// field of unresolved type
					Debug.Assert(target.ResultType == StackType.O || target.ResultType == StackType.I
						|| target.ResultType == StackType.Ref || target.ResultType == StackType.Unknown,
						"Field of unresolved type with invalid target");
					break;
			}
		}
	}
}
